Operando study of mechanical integrity of high-volume expansion Li-ion battery anode materials coated by Al2O3.
Nanotechnology
; 34(23)2023 Mar 20.
Article
em En
| MEDLINE
| ID: mdl-36827694
ABSTRACT
Group IV elements and their oxides, such as Si, Ge, Sn and SiO have much higher theoretical capacity than commercial graphite anode. However, these materials undergo large volume change during cycling, resulting in severe structural degradation and capacity fading. Al2O3coating is considered an approach to improve the mechanical stability of high-capacity anode materials. To understand the effect of Al2O3coating directly, we monitored the morphology change of coated/uncoated Sn particles during cycling using operando focused ion beam-scanning electron microscopy. The results indicate that the Al2O3coating provides local protection and reduces crack formation at the early stage of volume expansion. The 3 nm Al2O3coating layer provides better protection than the 10 and 30 nm coating layer. Nevertheless, the Al2O3coating is unable to prevent the pulverization at the later stage of cycling because of large volume expansion.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Nanotechnology
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Estados Unidos